<div class="gmail_quote">On Sun, Dec 30, 2012 at 6:25 PM, Johnny Rosenberg <<a href="mailto:gurus.knugum@gmail.com" target="_blank">gurus.knugum@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> In a terminal (things in <> are instructions, don't type those…): $ cat > Musicians FALSE First Name FALSE Second Name FALSE Third Name <Press Ctrl+d> $ zenity --list --title "Select musicians" --text="Some text" --column="Select" --column="Musician" --checklist --separator="\n" --height=480 --width=370 < Musicians The dialogue opens. Now hit OK or Cancel. Now, sometimes this works, but most of the time the dialogue freeze. The terminal shows the following: (zenity:3629): GLib-WARNING **: /build/buildd/glib2.0-2.32.3/./glib/giounix.c:411Error while getting flags for FD: Bad file descriptor (9) (zenity:3629): GLib-WARNING **: /build/buildd/glib2.0-2.32.3/./glib/giounix.c:411Error while getting flags for FD: Bad file descriptor (9) (zenity:3629): GLib-WARNING **: /build/buildd/glib2.0-2.32.3/./glib/giounix.c:411Error while getting flags for FD: Bad file descriptor (9) and so on. Ctrl+c in the terminal cancels the dialogue. So, what is this? User error or Zenity error? If user error, what did I do wrong? This worked in Ubuntu 10.10, at least better than in Ubuntu 12.04. I think I remember that it freeze in Ubuntu 10.10 too, but not almost every time, like it does in Ubuntu 12.04. Kind regards Johnny Rosenberg $B%8%g%K!<!&%m!<%<%s%P!<%0(B</blockquote><div> Hi Johnny, The bad file descriptor number 9 very likely refers to a pipe file descriptor. The process on the other end of the pipe dies, and the process at the other end will not longer be able to read/write the pipe, and thus reports this error. This is hapenning in the background, so you do not see it. One way to get a total backtrace of all threads involved (and thus determine which thread is exiting and thus closing it's FD's), is to run the command like so: strace -tt -ff -o /tmp/zenity zenity --list --title "Select musicians" --text="Some text" --column="Select" --column="Musician" --checklist --separator="\n" --height=480 --width=370 < Musicians The files in /tmp called zenity.<pid> will contain the per-pid system calls. Each system call preceded by a full timestamp. This way you will be able to tell which thread exited or closed the FD before the thread that wanted to read/write to it was hit with the error. </div></div>